diff --git a/mello.cabal b/mello.cabal
--- a/mello.cabal
+++ b/mello.cabal
@@ -1,11 +1,11 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.37.0.
+-- This file has been generated from package.yaml by hpack version 0.39.1.
 --
 -- see: https://github.com/sol/hpack
 
 name:           mello
-version:        0.3.0
+version:        0.4.0
 synopsis:       No-fuss syntax with s-expressions
 description:    Please see the README on GitHub at <https://github.com/ejconlon/mello#readme>
 category:       Parsing
@@ -70,8 +70,8 @@
   ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wpartial-fields -Wredundant-constraints -fno-warn-unused-top-binds
   build-depends:
       base >=4.12 && <5
-    , bowtie ==0.4.*
-    , containers ==0.6.*
+    , bowtie ==0.7.*
+    , containers >=0.6 && <0.8
     , foldl ==1.4.*
     , looksee ==0.8.*
     , mtl >=2.3 && <2.5
@@ -120,8 +120,8 @@
   ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wpartial-fields -Wredundant-constraints -fno-warn-unused-top-binds -threaded -rtsopts -with-rtsopts=-N
   build-depends:
       base >=4.12 && <5
-    , bowtie ==0.4.*
-    , containers ==0.6.*
+    , bowtie ==0.7.*
+    , containers >=0.6 && <0.8
     , daytripper ==1.0.*
     , foldl ==1.4.*
     , looksee ==0.8.*
@@ -129,7 +129,7 @@
     , mello
     , mtl >=2.3 && <2.5
     , prettyprinter ==1.7.*
-    , prop-unit >=1.0.1 && <1.1
+    , prop-unit ==1.0.*
     , recursion-schemes ==5.2.*
     , scientific ==0.3.*
     , text >=2.0 && <2.2
diff --git a/test/Main.hs b/test/Main.hs
--- a/test/Main.hs
+++ b/test/Main.hs
@@ -26,10 +26,10 @@
 expectParseSexp = expectParsePretty (fmap unMkMemo sexpParser) cmpEq
 
 parseCase :: TestName -> Sexp -> TestTree
-parseCase n = testRT Nothing . mkUnitRT n expectParseSexp
+parseCase n = testRT undefined . mkUnitRT n expectParseSexp
 
 parseCaseAs :: TestName -> Text -> Sexp -> TestTree
-parseCaseAs n t = testRT Nothing . mkUnitRT n (expectRendered t expectParseSexp)
+parseCaseAs n t = testRT undefined . mkUnitRT n (expectRendered t expectParseSexp)
 
 testParsing :: TestTree
 testParsing =